It was hotter in the front of my house where the sun would hit it directly all day, than the sides where there were single-story homes flanking our two-story house. However, the single-story homes had spanish style teracotta shingles and not the black slate the two-story homes had. That might have made a difference, I guess.

Are you alright op?

Yeah, that's how convection and radiation work. Do I notice it? No. Do I care? No. It's hot as balls with or without the neighbors house next door, I'll be running fans and the a/c regardless.

If you're asking for the engineering of it all, you're looking for study materials from Heat Transfer courses, keywords: convection, radiation, R-value, emissivity.

You do have walls where you live?

I live next to a same height house that is down the hill a bit and it gets really damned hot but I never thought of this as a cause. I don't think so anyway since I have the window open on that side and its generally a comparatively cool breeze coming in

I live surrounded by houses lower than mine and no, their roofs don't make my place warmer.